Ducati MONSTER 821 - Timing System

Timing system
DESMODROMIC system with four valves per
cylinder controlled by eight rocker arms (four opening
and four closing ones) and two overhead camshafts.
This system is driven by the crankshaft through spur
gears, pulleys and toothed belts.
Desmodromic timing system
1) Opening (or upper) rocker arm;
2) Upper rocker arm shim;
3) Closing (or lower) rocker arm shim;
4) Return spring for lower rocker arm;
5) Closing (or lower) rocker arm;
6) Camshaft;
7) Valve.
6
1
2
2
2 1
5
3
5
4
7
Fig. 213
278